Territory



(No Model.)

D. LEWIS, J. H. WILLIAMS & M. MAT

TI-IEWS.

GALGINING FURNACE. No. 404,720.

Patentedflune 4, 1889.

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[Win T0726 V 2%- Q d .zliiowzeyf UNITED STATES PATENT OFFICE.

DAVID LEWIS, JOHN H. \VILLIAMS, AND MAGGIE MATTHEWS, OF ANAOONDA, MONTANA TERRITORY.

CALCINING-FURNACE.

SPECIFICATION forming part of Letters Patent No. 404,720, dated June 4, 1889.

Application filed August 2, 1887.

To all whom it may concern:

Be it known that we, DAVID LEWIS, JOHN H. WILLIAMS, and IVIAGGIE MATTHEWS, citizens of the United States, residing at Anaconda, in the county of Deer Lodge and Territory of Montana, have invented certain new and useful Improvements in Oalcining-Furnaces; and we do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

Our invention relates to a furnace for the calcining of ores. Its object is the calcining of any kind of ore or material with or without sulphides. If the ore contain sulphur, it can be calcined without the use of fuel after the fire is started. WVe attain this object by the means illustrated in the accompanying drawings, in which Figure l is a front elevation of the furnace, partly in section, showing, respectively, the cylinders, chute, fans, inclines or steps, fireboxes, dzc. Fig.2 is a side elevation showing a vertical section through center of same.

A is the iron or wooden hopper into which the ore is placed to be fed into the furnace. The hopper A is provided with the stirringcylinder B, having journals a, and the feeding-cylinders C, with the journals 1). Said journals work in any suitable bearings within the hopper A. The cylinders B C are made of suitable material and arranged as shown in Fig. 2that is, the feeding-cylinders C are located horizontally and so close to each other that the ore in passing between them will be thoroughly crushed. The stirring-cylinderl3 is parallel to said feeding-cylinders, and is located between and over them, so that the three cylinders when in position for use constitute in form an isosceles triangle. The cyl inder B is provided upon its outer surface at intervals with spurs b, which aid in stirring the ore effectually. It can readily be seen that said cylinders thus located and operating within the hopper A will provide a uniform feed and thoroughly pulverize the ore, so

i the steps.

the ore falling upon them.

Serial No. 245,936. (No model.)

that when it reaches the interior of furnace it is in an excellent condition to be acted upon. Motion is imparted to said cylinders by means of horse-power or engine, or in any other desirable way.

D designates the main chute or flue of the furnace. Near the top of the chute D there is a small flue (l, leading into the return-flue G, which extends to the base of the furnace, and is there connected with the smoke-stack. As a smoke-stack to a furnace is as old as the art, and as in our invention it can be placed near or at any distance from the furnace, we do not wish to limit ourselves to any particular location or kind of stack.

E represents the fans for drying the ore. These fans are located upon suitable bearings in the chute D, between the inclines or steps F. They are made of any fire-proof substance and are constructed as fans ordinarily are. The chief object of said fans is to dry the ore and assist in depositing and distributing it upon Motion is transmitted to them by The steps or inclines F are built at intervals upon each side of the chute D throughout its entire length. They are constructed in a right-angle triangular shape and so arranged as to keep the ore in motion and conduct it to the crucible or central chamber I. I

ll indicates the fire-boxes or heating-furnaces. They are provided with the doors h and the grate h, underneath of which is the ash-box 7L2. There are flues J leading from the fire-boxes H into the main chute or flue D, through which the flames ascend, meeting the ore in its descent.

K is the sliding door for the purpose of loading the ore into the car. The height of the furnace is usually thirty (30) feet, (more or less,) and the chute two by six feet in the clear, though it may be of any required size, and the furnace is built of brick.

L is an arch at the bottom of the furnace, where car enters to receive the ore.

In calcining ores containing sulphides or any combustible material fire is needed only until theybegin to burn. The usual mode of stirring ores in furnaces heretofore employed in calcining is the objectionable feature. Our

invention obviates this and provides an easy, simple, and inexpensive method.

The operation of our furnace is as follows: The ore, concentrates, or material to be acted upon is placed in the hopper A, from which it is fed by means of the revolving cylinders B G into the main chute D. Said cylinders are so arranged as to thoroughly stir the ore and provide a uniform feed. The ore then falls upon the fans E, which revolve by the Weight of the ore, thence upon the inclines or steps F, which are built at such an angle as will keep the ore in motion until it reaches the central combustible room I, which is directly over a track, upon which a car can be run, and into which the ore is loaded by means of a sliding door K.

Having fully described our invention, what we claim as new, and desire to secure by Letters Patent, is

In a furnace for calcining ores, the combination of a stack provided with oppositely-inclined internal projections and alternate fanwheels located horizontally between said projections, a hopper upon the top of the stack provided gith feed-rollers, a chamber at the bottom of the stack provided with an inclined bottom and a discharge-door at the lower part thereof, an open archway directly under said door, one or more furnaces n ear the bottom of said stack, having exit-fines communicating with said chamber, and a down-comer into which the stack opens near its upper end, substantially as described.

In testimony whereof We afiix oursignatures 3 5 in presence of two witnesses.

DAVID LEXVIS.

JOHN H. \VILLIAMS.

MAGGIE MAT .IIEWS.

\Vitnessos:

'1. JoHNsoN, M. J. Frrz PATRICK. 

